The accurate measurement of the colorimetry of a CRT is a challenging task that is affected by many factors. New advances in electronics and computer technology have enabled the development of high quality, low cost, sensing mechanisms. The integration of color management facilities into computer operating systems has led to increased consumer demand for on-line, or embedded, measurement and control capability of individual color displays. The embedded measurement device may be attached either to the monitor directly or to the host computer which drives the monitor. The demand for lower cost measurement does not mean that specifications can be compromised. The techniques for achieving these goals are described in this work.